Liquid fuel burner



Aug. 19, 1941. H, M ULL'STRAND 2,253,056

LVIQUID FUEL BURNER Filed Oct. 5, 1937 BY )MllvENoR Y M /l/ALT'FORNEY.

Patented Aug'. 19, 1941 LIQUID FUEL BURNER i Hugo M. Ullstrand, Evansville, Ind., assignor to Servel, Inc., New York, N. Y., a corporation of Delaware Application October 5, 1937, Serial No. 167,349

1 Claim.

My invention relates to a liquid fuel burner and more particularly to aliquid fuel burner for a continuous absorption refrigerator, and has for its object to provide an improved burner particularly adapted for automatic regulation.

The above and other objects and advantages of the invention will become apparent from the following description taken in connection with the accompanying drawing forming a part of this specification, and of which:

'in connection with a refrigerator comprising a cabinet Il) having a thermally insulated storage compartment :II into which access may be had by a door I2 hinged to the front of the cabinet. The storage compartment Il is kept at a devsired low temperature by a cooling element I4. The cooling element I4 forms a part of an absorption refrigeration apparatus unit of the type described in Patent No. 2,037,782` to William R. Hainsworth.

The absorption refrigeration unit is mounted in the cabinet I and includes a generator having a horizontal portion I5 located in an apparatus compartment' I6 below the storage compartment Il. The horizontal portion I5 of the generator includes an inner heating flue I1 and an outer heating ilue I8. The outer heating ilue I8 is embedded in suitable heat insulating material I9 retained in a shell or casing 20. The forward end of the heating flue I8 is provided with an opening to receive the upper end of a burner 22. Liquid fuel, such as kerosene, for example, is supplied from a storage tank (not shown) through a conduit 23 and a liquid level control' is connected. A valveseat 28 is formed at the lower end of sleeve 21 and above this valve seat are located a plurality of openings 29. To the sleeve 21 is secured a bracket 30 having pivotally mounted thereon an arm 3| of a float 32. The arm 3| is provided with rounded bifurcated ends A vertical sleeve 21 lowhich fit about a reduced portion of a needle valve 33 which is vertically movable in sleeve 21.

Within casing .25 is pivoted a lever 35 which overlies the float 32. The lever 35 is formed with a downwardly extending projection 36 which is adapted to rest on the float 32, whereby the weight of lever 35 may be added to the weight of the float. The outer end of lever 35 is bent upward and provided with an opening 31 to r'eceive the outer en d of a resilient leaf-spring 38 which is secured at its other end to a wall of casing 25. The spring 3B normally tends to move lever 35 upward whereby the lever 35 is removed from the float 32. v

The spring 38 is provided with an upward extension 39 which is adapted to contact and bear against an expansible diaphragm 40. The diaphragm 4D is secured to a hollow hub ,member 4I which in turn is xed in an opening in a re- The diaphragm 42 is sesilient diaphragm 42. cured between the upper end of casing 25 and theremovable cover 26 and is adjustable by an adjustment screw 43 extending through the cover 26. The expansible diaphragm 4U is connected by a capillary tube 44 to a bulb 45 which, as shown in Fig. 1, is arranged in thermal exchange relation with the cooling element I4 of the refrigeration apparatus. The expansible diaphragm 40, capillary tube 44, and bulb 45 constitute an expansible fluid thermostat which is charged with a suitable volatile fluid that increases and decreases in volume with corresponding changes in temperature.

When the temperature of cooling element I4 increases and the expansible diaphragm 40 expands sufficiently, the spring 38 is moved downwardly such a distance that lever 35 is permitted to rest upon the float 32. With the Weight of lever 35 added to that of the oat 32, the weighted noat 32 closes the valve 33 when liquid in the oat chamber 46 is at the level indicated at A. When the temperature of cooling element .I4 decreases and the expansible diaphragm 40 contracts suiliciently, the spring 38 moves up and raises lever 35 from the float 32. With the weight of lever 35 removed from float 32, the needle valve 33 will remain closed until the liquid level in the oat chamber 46 reaches a level indicated at B.

In accordance with my invention, I provide the burner 22 which is constructed and arranged for efficient operation with a liquid level control of the character just described. The burner 22 includes a burner well having one half 41 of greater depth than the other half 48. The portions a maximum name.

41 and 48 of the burner well are connected by burner tubes 49 and 56 and conduit 5i to the lower part of the oat chamber 46.

A pair of spaced perforated chimneys 52 and 53 extend upward from the upper end of the burner well, and about the chimneys is provided an enclosing shell 54. The upper end of the inner chimney 52 is closed by a cap 55. At the juncture o f the portions 41 and 48 of the burner well partitions 56 extend upward for a short distance in the annular space 51 formed by the chimneys 52 and 53.

When operation of the burner 22 is started, liquid fuel ilows through the supply conduit 23 past the needle valve 33 into float chamber 46. Assuming that the expansible diaphragm 40 has expanded suiiciently to permit lever 35 to rest on the float 32, liquid ilows from oat chamber 46 through conduit 5| and burner tubes 49 and 50 into both portions 41 and 48 of the burner well until the level indicated at A is reached. Upon starting the burner 22, the refrigeration apparatus is heated with what may be referred to as 'I'he liquid fuel is maintained at a high level by the liquid level control 24, and vaporization of liquid takes place within both portions 41 and 48 of the burner well.

When the temperature of the cooling element i4 reaches a predetermined low temperature, the expansible diaphragm 40 contracts sufllciently, as described above, to permit spring 36 to remove lever 35 from the float 32, whereby the liquid level recedes towards the lower level indicated at B.

The burner flame becomes smaller as the liquidlevel becomes lower, and, when the liquid is at the lower level, vaporization of liquid is effected about the portion 41 of the lburner well. Since vapor is produced in only about h alf the burner well-with liquid at the lower level, the refrigeration apparatus is heated under these conditions with what may be referred to as a minimum flame. By providing the partitions 56 to divide the annular space 51, the llame is restricted to approximately half-way about the chimneys 52 and 53, so that a relatively small flame is produced with liquid at the lower level. In order to accelerate the ignition of liquid in the portion 48 of the burner well when liquid rises to the higher level, la wick 58 may be provided at the upper end of burner tube 50.

While I have shown and described a particular embodiment of the invention, I do not wish to be limited to the particular arrangement set forth, and I therefore aim in the following claim to cover all m'odications and changes that fall withinthe true spirit and scopev of the invention.

What is claimed is:

In a liquid fuel burner, an annular vaporizing well having two parts, an annular combustion chimney on said vaporizing well. a liquid level control device having' a connection to each part of said well, one part of said well being shallower than the other part so that when a certain high liquid level is maintained by said control device,

l liquid is contained in and vaporizes in both parts,

but when a certain low liquid level is maintained by said device, liquid is contained in and vapori'zes in only the deeper of said parts, and partition walls separating said well parts and extending upward into said chimney so that when vaporization takes place in only one part the ilame is restricted to substantially only that part of the chimney above said well part in which vaporization occurs.

HU GO M. ULLSTRAND. 

